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annotate mamba/widgets/base.py @ 189:aeacd8dfeb07

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Add grab_focus helper
author Neil Muller <drnlmuller@gmail.com>
date Wed, 14 Sep 2011 17:42:47 +0200
parents 5f286cbb15e3
children 51d54026b153
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1 import collections
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2
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3 import pygame
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4 from pygame.constants import K_UP, K_DOWN, K_RETURN
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5 from pygame.locals import MOUSEMOTION, MOUSEBUTTONUP, MOUSEBUTTONDOWN, KEYDOWN
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6
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7
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8 class Widget(object):
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9
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10 def __init__(self, rect):
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11 if not isinstance(rect, pygame.Rect):
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12 rect = pygame.Rect(rect, (0, 0))
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13 self.rect = rect
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14 self.focussable = False
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15 self.focussed = False
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16 self.parent = None
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17 self.callbacks = collections.defaultdict(list)
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18
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19 def add_callback(self, eventtype, callback, *args):
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20 self.callbacks[eventtype].append((callback, args))
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21
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22 def event(self, ev):
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23 for callback, args in self.callbacks[ev.type]:
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24 if callback(ev, self, *args):
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25 return True
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26 return False
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27
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28 def draw(self, surface):
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29 "Override me"
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30 pass
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31
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32 def grab_focus(self):
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33 if self.focussable and self.parent:
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34 self.parent.defocus()
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35 self.focussed = True
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36
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38 class Button(Widget):
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39
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40 def event(self, ev):
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41 if super(Button, self).event(ev):
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42 return True
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43 if (ev.type == MOUSEBUTTONDOWN
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44 or (ev.type == KEYDOWN and ev.key == K_RETURN)):
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45 for callback, args in self.callbacks['clicked']:
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46 if callback(ev, self, *args):
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47 return True
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48 return False
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50
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51 class Container(Widget):
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52
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53 def __init__(self, rect):
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54 super(Container, self).__init__(rect)
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55 self.children = []
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56 self.focussed_child = None
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57
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58 def event(self, ev):
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59 """Push an event down through the tree, and fire our own event as a
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60 last resort
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61 """
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62 if ev.type in (MOUSEMOTION, MOUSEBUTTONUP, MOUSEBUTTONDOWN):
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63 for child in self.children:
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64 if child.rect.collidepoint(ev.pos):
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65 if ev.type == MOUSEBUTTONDOWN and child.focussable:
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66 root = self
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67 while root.parent is not None:
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68 root = root.parent
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69 root.defocus()
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70 widget = child
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71 while widget.parent is not None:
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72 parent = widget.parent
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73 if isinstance(parent, Container):
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74 idx = parent.children.index(widget)
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75 parent.focussed_child = idx
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76 widget = parent
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77 child.focussed = True
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78
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79 if child.event(ev):
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80 return True
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81
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82 elif ev.type == KEYDOWN:
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83 for child in self.children:
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84 if child.focussed:
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85 if child.event(ev):
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86 return True
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87 else:
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88 # Other events go to all children first
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89 for child in self.children:
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90 if child.event(ev):
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91 return True
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92 if super(Container, self).event(ev):
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93 return True
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94 if (self.parent is None and ev.type == KEYDOWN
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95 and ev.key in (K_UP, K_DOWN)):
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96 return self.adjust_focus(1 if ev.key == K_DOWN else -1)
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97
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98 def add(self, widget):
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99 widget.parent = self
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100 self.children.append(widget)
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101 self.rect = self.rect.union(widget.rect)
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102
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103 def remove(self, widget):
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104 widget.parent = None
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105 if self.focussed_child is not None:
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106 child = self.children[self.focussed_child]
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107 self.children.remove(widget)
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108 # We don't update the rect, for reasons of simplificty and laziness
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109 if self.focussed_child is not None and child in self.children:
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110 # Fix focus index
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111 self.focussed_child = self.children.index(child)
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112 else:
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113 self.focussed_child = None
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114
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115 def defocus(self):
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116 if self.focussed_child is not None:
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117 child = self.children[self.focussed_child]
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118 if isinstance(child, Container):
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119 child.defocus()
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120 child.focussed = False
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121
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122 def adjust_focus(self, direction):
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123 """Try and adjust focus in direction (integer)
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124 """
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125 if self.focussed_child is not None:
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126 child = self.children[self.focussed_child]
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127 if isinstance(child, Container):
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128 if child.adjust_focus(direction):
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129 return True
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130 else:
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131 child.focussed = False
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132
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133 current = self.focussed_child
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134 if current is None:
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135 current = -1 if direction > 0 else len(self.children)
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136 if direction > 0:
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137 possibles = list(enumerate(self.children))[current + 1:]
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138 else:
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139 possibles = list(enumerate(self.children))[:current]
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140 possibles.reverse()
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141 for i, child in possibles:
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142 if child.focussable:
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143 child.focussed = True
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144 self.focussed_child = i
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145 return True
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146 if isinstance(child, Container):
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147 if child.adjust_focus(direction):
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148 self.focussed_child = i
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149 return True
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150 else:
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151 if self.parent is None:
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152 if self.focussed_child is not None:
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153 # At the end, mark the last one as focussed, again
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154 child = self.children[self.focussed_child]
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155 if isinstance(child, Container):
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156 if child.adjust_focus(-direction):
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157 return True
106
d1152f2a0e13 Mouse affects focus
Stefano Rivera <stefano@rivera.za.net>
parents: 99
diff changeset
158 else:
d1152f2a0e13 Mouse affects focus
Stefano Rivera <stefano@rivera.za.net>
parents: 99
diff changeset
159 child.focussed = True
d1152f2a0e13 Mouse affects focus
Stefano Rivera <stefano@rivera.za.net>
parents: 99
diff changeset
160 return True
95
7a17c5b74148 Correctly handle nested Containers. Set focus on root container at first draw
Stefano Rivera <stefano@rivera.za.net>
parents: 77
diff changeset
161 else:
7a17c5b74148 Correctly handle nested Containers. Set focus on root container at first draw
Stefano Rivera <stefano@rivera.za.net>
parents: 77
diff changeset
162 self.focussed_child = None
77
Stefano Rivera <stefano@rivera.za.net>
parents: 59
diff changeset
163 return False
Stefano Rivera <stefano@rivera.za.net>
parents: 59
diff changeset
164
23
d0e8940df703 Widgets -> base
Stefano Rivera <stefano@rivera.za.net>
parents:
diff changeset
165 def draw(self, surface):
106
d1152f2a0e13 Mouse affects focus
Stefano Rivera <stefano@rivera.za.net>
parents: 99
diff changeset
166 if self.parent is None and not self.focussed:
95
7a17c5b74148 Correctly handle nested Containers. Set focus on root container at first draw
Stefano Rivera <stefano@rivera.za.net>
parents: 77
diff changeset
167 self.focussed = True
7a17c5b74148 Correctly handle nested Containers. Set focus on root container at first draw
Stefano Rivera <stefano@rivera.za.net>
parents: 77
diff changeset
168 self.adjust_focus(1)
23
d0e8940df703 Widgets -> base
Stefano Rivera <stefano@rivera.za.net>
parents:
diff changeset
169 for child in self.children:
24
30d4f3e62bcf Refactor widgets *again*, add container to Habitat
Stefano Rivera <stefano@rivera.za.net>
parents: 23
diff changeset
170 child.draw(surface)